This amplifier producedin the early
1970’s by Sansui Company inc. Japan .

Photos:

front ^

Front detail.

detail back.

bottom view: Hitachi 2SC1030 power transistors ^

interior view with main pcb ^

The restored power supply.

Unrestored pcb of the power amp and the heatsinked driver
transistors.

The restored pcb of the power amp, the capacitors of the output
are left as is, as they are ok for now, all other caps are replaced.

Special
futures:

This amp was well known by audio enthousiasts as
it has the mid-range tone control, very typical for this amplifier model range
of Sansui.
All High quality amps of Sansui made in that time frame are equipped with
mid-range tone control.

Most electrolytic capacitors can be replaced. The driver
transistors can get quite noisy, they should be heat sinked and/or can be replaced by
modern drivers. The power
amp input transistor can be replaced by a modern input transistor, a BC560C does
the job ok.
The diodes of the power supply should be replaced by modern 100V 10A
diodes. Coupling capacitors in the signal path should be replaced.
There are some electronic design flaws in this amplifier but:
If you are aquainted with electronics and amplifier design and amplifier
building priciples, you will be able to make this to a
very good HiFi amplifier with outstanding specs and very good sounding.
This amplifier is worth updating: (There
are many tricks that the electronics expert knows to get the most out of an
AU555A).

Here a power supply Elna capacitor that is ok after so many
years, it has 2260 uF, no need to replace.

Sound:

These series of audio
components soon got legendary by their outstanding build quality and extra
features and good
sound.